No, not necessarily. Some slang can be, but most slang is not.
I don' think that there is a slang word for rude.
slang for ghetto bad rude
A quim is a slang (and rude) word for a vagina
It is slang and a vulgar word
Rude boy is a very popular slang term. It is used to characterize someone as obnoxious, disgraceful, distasteful, and terrible. The term originated in Jamaica.
Slang word for testicles or bollocks
without being rude, the abbreviation fml means f**k my life in slang.
It's rude slang for female oral sex.
It is a rude/slang way of saying a male has an erection in the morning.
It's a rude slang term meaning 'you' Only use it with your worst enemies.
Pejoritive : rude, offensive, generalizing, slang. Trash talking.
Rude, disrespectful, will do anything, uncouth, foul mouth